~38.5 across (my rear cart tray is 43” across)
~30.5 deep plastic to plastic
~35.5 deep from door to seats (reclined to a normal setting). @12 inch height (this is what my rear cargo tray is at)
These were taken with my cargo tray installed on top of a floor liner (husky/weather tech), but should give you an idea of what you’re looking for.